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Issue #23517: Fix _PyTime_ObjectToDenominator() 

* initialize numerator on overflow error ensure that numerator is smaller than
* denominator.
This commit is contained in:
Victor Stinner 2015-09-02 10:37:46 +02:00
parent a53ec7a91a
commit 67edcc905d
1 changed files with 17 additions and 18 deletions
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33
Python/pytime.c
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@ -60,6 +60,7 @@ _PyLong_FromTime_t(time_t t)
#endif
}
/* Round to nearest with ties going away from zero (_PyTime_ROUND_HALF_UP). */
static double
_PyTime_RoundHalfUp(double x)
{
@ -81,32 +82,31 @@ _PyTime_DoubleToDenominator(double d, time_t *sec, long *numerator,
floatpart = modf(d, &intpart);
if (floatpart < 0) {
floatpart = 1.0 + floatpart;
floatpart += 1.0;
intpart -= 1.0;
}
floatpart *= denominator;
if (round == _PyTime_ROUND_HALF_UP)
floatpart = _PyTime_RoundHalfUp(floatpart);
else if (round == _PyTime_ROUND_CEILING) {
else if (round == _PyTime_ROUND_CEILING)
floatpart = ceil(floatpart);
else
floatpart = floor(floatpart);
if (floatpart >= denominator) {
floatpart = 0.0;
floatpart -= denominator;
intpart += 1.0;
}
}
else {
floatpart = floor(floatpart);
}
assert(0.0 <= floatpart && floatpart < denominator);
*sec = (time_t)intpart;
*numerator = (long)floatpart;
err = intpart - (double)*sec;
if (err <= -1.0 || err >= 1.0) {
error_time_t_overflow();
return -1;
}
*numerator = (long)floatpart;
return 0;
}
@ -123,9 +123,9 @@ _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
}
else {
*sec = _PyLong_AsTime_t(obj);
*numerator = 0;
if (*sec == (time_t)-1 && PyErr_Occurred())
return -1;
*numerator = 0;
return 0;
}
}
@ -167,7 +167,7 @@ _PyTime_ObjectToTimespec(PyObject *obj, time_t *sec, long *nsec,
{
int res;
res = _PyTime_ObjectToDenominator(obj, sec, nsec, 1e9, round);
assert(0 <= *nsec && *nsec < SEC_TO_NS );
assert(0 <= *nsec && *nsec < SEC_TO_NS);
return res;
}
@ -177,7 +177,7 @@ _PyTime_ObjectToTimeval(PyObject *obj, time_t *sec, long *usec,
{
int res;
res = _PyTime_ObjectToDenominator(obj, sec, usec, 1e6, round);
assert(0 <= *usec && *usec < SEC_TO_US );
assert(0 <= *usec && *usec < SEC_TO_US);
return res;
}
@ -444,12 +444,11 @@ _PyTime_AsTimeval_impl(_PyTime_t t, struct timeval *tv, _PyTime_round_t round,
tv->tv_sec += 1;
}
assert(0 <= usec && usec < SEC_TO_US);
tv->tv_usec = usec;
if (res && raise)
_PyTime_overflow();
assert(0 <= usec && usec <= 999999);
tv->tv_usec = usec;
return res;
}
@ -484,7 +483,7 @@ _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts)
}
ts->tv_nsec = nsec;
assert(0 <= ts->tv_nsec && ts->tv_nsec <= 999999999);
assert(0 <= ts->tv_nsec && ts->tv_nsec < SEC_TO_NS);
return 0;
}
#endif